Hazard Map of a Small Island : A Case Study of Kashima Island for Slope Stability in Japan(<Featured Articles>Turkey-Japan Joint Conference on Geomorphology)

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In this article, we have drawn the hazard map of the Kashima Island without distinct watershed system. The island is composed of granodiorite and andesite. Hazardous areas on its western slope have caused rockfalls and earthflows. Thus, identification of unstable slope areas and carry out hazard distinction has become our main concern in the Kashima Island. After the geological investigation of whole island, we have identified three hazardous areas by using handy seismic refraction method, observation of thin sections of rocks, and X-ray diffraction test. Since the Kashima Island does not have distinct watershed system, ridge line, geologic boundaries and rock joints have been used as boundary markers. Our method of utilizing geomorphological and geologic factors is a new way of distinguishing hazardous areas.
2011-04-25